Using $stateParams injection for unit testing Angular applications with Karma

Here is the starting point for the controller code:

angular
.module('hc.hotelContent')
.controller('NameLocationController', nameLocationCtrlFn); //Todo change hotelDataService
nameLocationCtrlFn.$inject = ['$stateParams', 'hotelDataService'];

  function nameLocationCtrlFn($stateParams, hotelDataService) {
       var vm = this,
       hotelId = $stateParams.hotelId;
       vm.Keys = {
        Name: 'Name',
        Street: 'Street',
        City: 'City',
        State: 'State',
        Zip: 'Zip',
        Country: 'Country'
    }
}

I have additional code as well but it doesn't affect the logic. My tests work fine without injecting $stateParams into the controller.
Now, here's the Test file:

    describe('nameLocation component Controller', function () {
    var $controller,
            hotelDataServiceMock,
           stateParams,
            hotelId = "4611";
Keys = {
        Name: 'Name',
        Street: 'Street',
        City: 'City',
        State: 'State',
        Zip: 'Zip',
        Country: 'Country'
    }//@
    beforeEach(module('hc.hotelContent'));
        beforeEach(module('hc.app.core'));
        beforeEach(inject(injectFn));
       function injectFn(_$controller_, $stateParams, _hotelDataService_) {
            $controller = _$controller_;
            stateParams = $stateParams;

            hotelDataServiceMock = _hotelDataService_;
        } //controller injection fn

        function initCtrl() {
            controller = $controller('NameLocationController', {
                $stateParams: stateParams,
                hotelDataService: hotelDataServiceMock
            });
        }
describe('inserting a new hotel', function () {
        it('should populate Keys object', function () {
            var controller = initCtrl();
            expect(controller.Keys).toEqual(Keys);
        });
   }
}

I'm encountering an Unknown Provider error. This issue doesn't seem to be related to my controller because all I'm doing in the controller is assigning the variable to the $stateParams variable. How can I resolve this injection problem? My karma.conf file is configured to load jQuery, Angular, UI-Router, and mocks in that particular order and then all the JavaScript and HTML files.

Edit: Prior to this, I came across this post, but despite adding beforeEach(module('hc.app')); to the code since I'm using UI-Router in my main app module, the issue still persists

Answer №1

Encountered a similar issue while testing $stateParams within a directive:

To resolve this, consider injecting $state

You can then utilize:

$state.go('namedurl', {your_params_here})
$rootScope.$digest() or $apply in your controller

This will effectively update the $stateParams. Attempting to inject $stateParams as a mock using a provider may result in them being overridden by the $state service.

Answer №2

Could the issue be that in your function injectFn, the parameter name $stateParams does not match the variable you are referencing (_$stateParams_)? It appears that _$stateParams_ is undefined within injectFn.

If this solution does not solve the problem, have you properly injected ui-router into your module, and ensured that the module has been loaded in your test environment? A similar issue was encountered in a question on Stack Overflow.

If your objective is to simply verify that the controller uses $stateParams.hotelId, you may consider mocking out $stateParams by implementing something like the following:

function injectFn(_$controller_, _hotelDataService_, $provide) {
    $controller = _$controller_;
    hotelDataServiceMock = _hotelDataService_;
    $provide.value('$stateParams', {
        hotelId: 'someId',
    });
}

function initCtrl() {
    return $controller('NameLocationController', {
         hotelDataService: hotelDataServiceMock,
    });
}

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